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. 2016 Sep 27;6(9):e903. doi: 10.1038/tp.2016.183

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Copyright © 2016 The Author(s)

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Contextual generalization gradients. %Freezing (mean and s.d.) during the 8-min test in Experiments 1, 2 and 3. (a) Significant discrimination between contexts A and B (n=16 per group), ***P<0.001, unpaired t-test. (b) Generalization gradient with a gradual decrease in freezing from A to B to C (n=8 per group), *P<0.05, ***P<0.001, Tukey's post hoc tests. (c) Flatter generalization gradient with longer interval between training and test (8 days instead of 1 day; n=8 per group). (d) Illustrative comparison of generalization gradients with 1- and 8-day intervals. No statistical analyses were conducted because data are taken from two separate experiments (Experiment 2, with 1-day interval: ▴ and Experiment 3, with 8-day interval: ▾). Visual inspection of the graphs indicates no incubation of fear in context A, and more generalization in contexts B and C with the 8-day interval. Cxt, context.